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Variations of PM2.5 sources in the context of meteorology and seasonality at an urban street canyon in Southwest Germany

Song, Junwei ORCID iD icon 1; Saathoff, Harald ORCID iD icon 1; Gao, Linyu ORCID iD icon 1; Gebhardt, Reiner 2; Jiang, Feng ORCID iD icon 1; Vallon, Magdalena 1; Bauer, Jonas 3; Norra, Stefan 3; Leisner, Thomas ORCID iD icon 1
1 Aerosolforschung (IMKAAF), Karlsruher Institut für Technologie (KIT)
2 Institut für Geographie und Geoökologie (IFGG), Karlsruher Institut für Technologie (KIT)
3 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)


In order to assess the factors controlling urban air pollution, we characterized fine particulate matter (PM$_{2.5}$) at an urban street canyon in southwest Germany, in summer 2019 and winter 2020. The average mass concentration of PM$_{2.5}$ was higher in dry and hot summer (7.0 ± 3.5 μg m$^{−3}$) than in cold and humid winter (5.8 ± 2.8 μg m$^{−3}$) with frequent wet scavenging. The non-refractory PM$_{2.5}$ (NR-PM$_{2.5}$) measured with an aerosol mass spectrometer (AMS) plus black carbon (BC) mostly consists of organic aerosol (OA) with 60% in summer and 44% in winter. The contributions of sulfate to NR-PM$_{2.5}$ plus BC was higher in summer (18%) than in winter (13%), while that of nitrate was lower in summer (6%) than in winter (22%). During the entire measurement periods in both seasons, relatively flat diurnal variations of sulfate were found, suggesting that it was associated with regional transport. However, occasionally rapid increase of sulfate can be caused by the transport of upwind industrial sources and enhanced vertical mixing processes. Nitrate showed a peak at morning rush hours related to traffic emissions, and then subsequently decreased by evaporation processes during daytime with higher temperature. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000146875
Veröffentlicht am 01.06.2022
DOI: 10.1016/j.atmosenv.2022.119147
Zitationen: 6
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Aerosolforschung (IMKAAF)
Institut für Angewandte Geowissenschaften (AGW)
Institut für Geographie und Geoökologie (IFGG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2022
Sprache Englisch
Identifikator ISSN: 1352-2310, 0004-6981, 1873-2844, 1878-2442
KITopen-ID: 1000146875
HGF-Programm 12.11.12 (POF IV, LK 01) Atmospheric chemistry processes
Erschienen in Atmospheric Environment
Verlag Elsevier
Band 282
Seiten Art.-Nr.: 119147
Schlagwörter Urban air pollution; PM2.5; Aerosol mass spectrometer; Source apportionment; Meteorological effects
Nachgewiesen in Web of Science
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